Railways NTPC (Technical Ability) Analog and Digital Electronics Question Bank

done Analog and Digital Electronics Total Questions - 45

• question_answer1)
  A digital computer can memorize indefinitely
  A)
   only numerical data done clear
  B)
   only non-numerical data done clear
  C)
   both numerical and non-numerical data done clear
  D)
   neither numerical nor non-numerical data done clear
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• question_answer2)
  Which of the following circuit converts a JK flip-flop to T flip-flop?
  A)
    done clear
  B)
     done clear
  C)
    done clear
  D)
    done clear
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• question_answer3)
  Correction in decimal adder is required because
  A)
   sums are represented wrongly in binary code done clear
  B)
   sums are represented wrongly in BCD code done clear
  C)
   the numbers to be added are not represented in BCD code done clear
  D)
   none of these done clear
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• question_answer4)
  The function of strobe pulse in digital system is
  A)
   to reset memory registers done clear
  B)
   to check the functioning of a logic gate done clear
  C)
   to avoid race problem done clear
  D)
   to shift data in registers done clear
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• question_answer5)
  Which of the following is not a magnetic memory?
  A)
   Flip-flop                       done clear
  B)
   Tape done clear
  C)
   Drum               done clear
  D)
   Disk done clear
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• question_answer6)
  Registers and counters are similar in the sense that they both
  A)
   are made from an array of flip-flops and gates integrated on a single chip done clear
  B)
   store binary information done clear
  C)
   count pulses done clear
  D)
   are, in fact, shift registers done clear
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• question_answer7)
  The number of comparator circuits required to build a three bit simultaneous A/D converter is
  A)
   7                     done clear
  B)
   8 done clear
  C)
   15                                done clear
  D)
   16 done clear
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• question_answer8)
  What is the function of control unit in the CPU?
  A)
   Decoding of program instructions. done clear
  B)
   Transfer of data to primary storage. done clear
  C)
   Performing logical operations. done clear
  D)
   Storage of program instructions. done clear
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• question_answer9)
  Which of the following logics has excellent noise margin?
  A)
   TTL                             done clear
  B)
   ECL done clear
  C)
   CMOS  done clear
  D)
   All of these done clear
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• question_answer10)
  Programmable Logic Array (PLA) uses
  A)
   ROM matrices   done clear
  B)
   FROM matrices done clear
  C)
   RAM matrices    done clear
  D)
   Silo memory done clear
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• question_answer11)
  The output Y of the logic circuit given below is
  A)
    1                    done clear
  B)
   0 done clear
  C)
   X                                 done clear
  D)
     x done clear
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• question_answer12)
  In the sum of products function f (X, Y, Z) = E (2,3,4,5), the prime implicates are
  A)
   XY, XY            done clear
  B)
   XY, XYZ, XYZ done clear
  C)
   XYZ, XYZ, XY  done clear
  D)
   XYZ, XYZ, XYZ, XYZ done clear
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• question_answer13)
  A latch is _____ sensitive
  A)
   both level and edge        done clear
  B)
   edge done clear
  C)
   level                 done clear
  D)
   None done clear
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• question_answer14)
  How many bits are required to store one BCD digit?
  A)
   1                                 done clear
  B)
   2   done clear
  C)
   3                                 done clear
  D)
   4 done clear
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• question_answer15)
  m binary number system the first digit (bit) from right to left is called as
  A)
   LSB, Least Significant Bit done clear
  B)
   MSB, Most Significant Bit done clear
  C)
   First Bit done clear
  D)
   Last Bit done clear
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• question_answer16)
  A D-flip-flop is said to be transparent when
  A)
   The output is LOW done clear
  B)
   The output is HIGH done clear
  C)
   The output follows clock done clear
  D)
   The output follows input done clear
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• question_answer17)
  Which of these sets of logic gates are designated as universal gates?
  A)
   NOR, NAND.    done clear
  B)
   XOR, NOR, NAND. done clear
  C)
   OR, NOT, AND.            done clear
  D)
   NOR, NAND, XNOR. done clear
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• question_answer18)
  In the toggle mode a JK- flip-flop has
  A)
   J=0, K=0.                    done clear
  B)
   J=1, K=1. done clear
  C)
   J=0, K=1.                    done clear
  D)
   J=1, K=0. done clear
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• question_answer19)
  Which of the following is a digital device?
  A)
   Regulator of a fan          done clear
  B)
   Microphone done clear
  C)
   Resistance of a material done clear
  D)
   Light switch done clear
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• question_answer20)
  If a Hexadecimal numbers needs to convert to binary. For each hexadecimal digit, there will be how many bits
  A)
   1                                 done clear
  B)
   2 done clear
  C)
   4                                 done clear
  D)
   8 done clear
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• question_answer21)
  A three-state buffer has the following output states
  A)
   1, 0, float                     done clear
  B)
   High, Low, Float done clear
  C)
   Both A and B                done clear
  D)
   Set, Reset, Halt done clear
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• question_answer22)
  Temperature variation is a/an
  A)
   Digital quantity done clear
  B)
   Analog quantity done clear
  C)
   Either Digital or Analog quantity done clear
  D)
   None done clear
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• question_answer23)
  In Digital Logic Designs, GAL is abbreviated as
  A)
   General Advance Logic done clear
  B)
   General Array Logic done clear
  C)
   Generic Advance Logic done clear
  D)
   Generic Array Logic done clear
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• question_answer24)
  A digital circuit that can store on bit is a
  A)
   XOR gate                      done clear
  B)
   flip-flop done clear
  C)
   gate                             done clear
  D)
   register done clear
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• question_answer25)
  If J=K(J and K are shorted) in a JK flip-flop, what circuit is made
  A)
   SR flip-flop                   done clear
  B)
   Shorted JK flip-flop done clear
  C)
   T flip-flop         done clear
  D)
   K flip-flop done clear
  View Solution play_arrow

• question_answer26)
  Which logic family provides minimum power dissipation
  A)
   TTL                             done clear
  B)
   CMOS done clear
  C)
   BCL                             done clear
  D)
   JFET done clear
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• question_answer27)
  In a T flip-flop no of input circuit is
  A)
   1                     done clear
  B)
   2        done clear
  C)
   3                                 done clear
  D)
   4 done clear
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• question_answer28)
  A boolean function can be transformed into logical
  A)
   Graph              done clear
  B)
   Map done clear
  C)
   Diagram           done clear
  D)
   Matrix done clear
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• question_answer29)
  In Boolean algebra A.A is equal to
  A)
   A                     done clear
  B)
   A2      done clear
  C)
   2A                               done clear
  D)
   1 done clear
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• question_answer30)
  In Boolean algebra AND is represented by
  A)
   +                                done clear
  B)
   \[-\] done clear
  C)
   /                                  done clear
  D)
   \[\times \] done clear
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• question_answer31)
  Truth table is used to express
  A)
   Boolean expression        done clear
  B)
   Boolean map done clear
  C)
   Boolean matrix  done clear
  D)
   Boolean addition done clear
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• question_answer32)
  The boolean algebra is mostly based on
  A)
   Boolean theorem           done clear
  B)
   De Morgans theorem done clear
  C)
   D Morpans theorem done clear
  D)
   Standard theorem done clear
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• question_answer33)
  A+\[\overline{A}\] is equal to
  A)
   A                                 done clear
  B)
   A        done clear
  C)
   0                                 done clear
  D)
   1 done clear
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• question_answer34)
  Complement of XNOR and NOR is ___ and ____ respectively.
  A)
   NOR, XNOR                 done clear
  B)
   OR, NOR done clear
  C)
   XOR, NOR                    done clear
  D)
   XOR, OR done clear
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• question_answer35)
  Convert the binary number (1111000011110000) to hexadecimal number                                
  A)
   1010                done clear
  B)
   FOFO                    done clear
  C)
   7070                            done clear
  D)
   5050      done clear
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• question_answer36)
             Positive integers must be represented by                 
  A)
   Signed numbers done clear
  B)
   Unsigned number          done clear
  C)
   Both A and B                done clear
  D)
   None of these. done clear
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• question_answer37)
  EBCDIC is abbreviated as
  A)
   Extended Bit Coded Decimal Interchange Code done clear
  B)
   Extended Binary Coded Dictation Interchange Code done clear
  C)
   Extended Binary Color Decimal Interchange Code done clear
  D)
   Extended Binary Coded Decimal Interchange Code done clear
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• question_answer38)
  A sequence of binary digits is known as
  A)
   Bit string                       done clear
  B)
   Byte string done clear
  C)
   Input string                    done clear
  D)
   Word string done clear
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• question_answer39)
  Why decoder is used in the digital electronics?
  A)
   To convert coded information into non coded form done clear
  B)
   To convert non coded information into coded form done clear
  C)
   It is used to separate address bus and data bus done clear
  D)
   None of the above done clear
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• question_answer40)
  How the digital signals is transmitted through a single conductor?
  A)
   Parallel             done clear
  B)
   Analog done clear
  C)
   Serial   done clear
  D)
   None of the above done clear
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• question_answer41)
  How many input and output required for multiplexer?
  A)
   Many input and one output done clear
  B)
   One input and many output done clear
  C)
   One input and one output done clear
  D)
   None of the above done clear
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• question_answer42)
  When will be the output of an AND gate is HIGH if there are three inputs, A, B, and C?
  A)
   A=0, B=0, C=0           done clear
  B)
   A=1, B=1, C=0 done clear
  C)
   A=1, B=O, C=1          done clear
  D)
   A=1, B=1, C=1 done clear
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• question_answer43)
  Why small bubble is given on the output of the NAND gate symbol?
  A)
   Tristate             done clear
  B)
   Output is inverted done clear
  C)
   Open collector output done clear
  D)
   None of the above done clear
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• question_answer44)
  A quartz crystal oscillator consists of
  A)
   Only series resonant frequency. done clear
  B)
   Only parallel resonant frequency. done clear
  C)
   Both series and parallel frequencies. done clear
  D)
   Neither series nor parallel frequency. done clear
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• question_answer45)
  Quantities whose values very with time are
  A)
   digital               done clear
  B)
   scalar                   done clear
  C)
   analogue           done clear
  D)
   vetor    done clear
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